Insect repellent



UNITED STAT PATENT ()FFICE' INSECT REPELLENT Marshall Gates, Bryn Mawr, Pa., assignor to the United States of America as represented by the Secretary of the Army N Drawing. Application January 10, 1949, Serial No. 70,140

2 Claims. (Cl. 167-33) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) 2 The invention described herein, if patented, pyridine remained repellent to Aedcs aegz/pti for may be manufactured and used by or for the over 10 successive days. Government for governmental purposes, without For ease of application to the skin, the dithe payment to me of any royalty thereon. pyridine may be incorporated in a suitable inert This invention relates to insect repellents. 5 liquid or solid carrier such as mineral oil, alcohol, I have found that the application of dipyridine, petrolatum, etc. For ease and uniformity of apa compound having the structural formula plicaticn to the fabric, the dipyridine may be ap- N plied to the fabric in an inert solvent, such as al- 3 cohol, ether, etc. 111 Having thus described my invention, I claim: 1. An insect-repellent fabric comprising fabric U impregnated with dipyridine.

2. A process of repelling insects comprising and also known as nicotyrine, to the human skin applying dipyridine to the region from which or to a fabric aflords elfective protection against 1 th insects are 130 be repelledinsect bites, by repelling insects, particularly MARSHALL GATES. Aedes aegypti and Anopheles quadrimaculatus.

A number of tests to measure the repellency of REFERENCES CITED dillyl'idille against Aedes will/m Was Conducted The following references are of record in the by smearing the compound on the arms of test file of t patent: personnel, who then thrust their arms into cages containing Aedes aegypti. The arms were eX- UNITED STATES PATENTS posed for 30-minute intervals at 3 minutes each um Name Date until the first insect bite, 2,400,006 Jones et al May '7, 1946 Tests to measure the repellency of dipyridine impregnated fabrics against Aedes aegypti were OTHER REFERENCES conducted by uniformly impregnating mercer- Hackh, Chemical Dictionary, Blakiston Co.,

ized cotton hose with the compound at a rate i ade p ia, h rd d, 1934- e t y equivalent to 3.3 gms. per sq. ft., drawing the dipyridine.

dried hose over the arms of test personnel, who OSRD, Insect Control Committee Report No.

then thrust their covered arms into cages con- 28, Interim Rep ay 18, 1945, page taming Aedes aegypti for 1 to 2 minutes. If no 29, 0-2906, Nicotinamide. Publication date, Aug. bites or less than 5 bites were received, the tests 1, 1947. 167-OSRD.

were repeated each successive day until 5 or more Richardson, Toxicity of Dipyridyls and Cerbites during one exposure were received. tain Other Organic Compounds as Contact In- It was found that the application of dipyridine secticides. J. of Agricultural Research, Washafiords protection against Aedes aegypti for an ington, D. C., vol. 33, No. 7, Oct. 1, 1926-, pp.

average of 280 minutes. Against Anopheles 597-609. Page 598 considered particularly perquadrz'maculatus, an average repellency time of tinent. 167-33.

69 minutes was noted in analogous test. 40 Richardson et al., Toxity of Dipyridyls, from It was found that fabric impregnated with di- Chemical Abstracts, volume 21, page 472, 1927. 

1. AN INSECT-REPELLENT FABRIC COMPRISING FABRIC IMPREGNATED WITH DIPYRIDINE. 